fix: emit the browser_start when we reconnect after a lost socket con…

…nection to mimic the emit that occurs within onStart when the same state is set (karma-runner#3359)

lib/browser.js

@@ -124,6 +124,8 @@ class Browser {
       this.log.debug(`Lost socket connection, but browser continued to execute. Reconnected ` +
         `on socket ${newSocket.id}.`)
       this.setState(EXECUTING)
+      //!!! Since we lost connection but are executing make sure the browser_start event is triggered for reporting, etc.
+      this.emitter.emit('browser_start', this)
     } else if ([CONNECTED, CONFIGURING, EXECUTING].includes(this.state)) {
       this.log.debug(`Rebinding to new socket ${newSocket.id} (already have ` +
         `${this.getActiveSocketsIds()})`)